I'm currently contributing to Node.js and V8 full-time, working on diagnostics-related features. In the last year:

• I introduced executionAsyncResource()
• I contributed to parts of AsyncLocalStorage
• I create the incoming diagnostics_channel feature
• I significantly improved the performance of async_hooks in promise-heavy applications by avoiding GC-tracking of promises where no destroy hook is in-use
• I fixed PromiseHook support for thenables in V8, allowing context tracking with AsyncLocalStorage, or similar systems built on top of async_hooks, to correctly propagate context when using thenables, which are commonly used in database libraries
• I'm currently working on a rewrite of the PromiseHook support in V8 to use JSFunctions rather than C++, which eliminates many expensive barrier hops between generated code, runtime functions, and external C++. This should improve PromiseHook performance and therefore also async_hooks performance quite dramatically.

In the future, I hope to rewrite many parts of async_hooks to trigger lifecycle functions from within JavaScript, wherever possible, further eliminating barrier hops and being much friendlier to the optimizer in V8.